1. A fixed star of the first magnitude in Orion's left foot.

2. A star of the first magnitude, in Orion.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• ridell,
• rigte,
• rurel,
• migul,
• legel,
• riral,
• fragel,
• digal,
• ligal,
• riggeld,
• rigedly,
• riged,
• rigtly,
• migel,
• righer,
• vidgel,
• roiger,
• frugel,
• rivel,
• rigon

• Richelle,
• richly,
• Rickel,
• Riggle,
• rigil,
• reigel,
• rishel,
• Risley,
• riegel.

The plural form of "rigel" is "rigels".

The singular form of the word "rigel" is still "rigel". It is a proper noun and does not have a specific singular or plural form. Rigel is a star located in the Orion constellation.